Gulpin is a round, green, blob-like Pokémon. It has a black parallelogram on its back and a yellow feather-like appendage on its head. Gulpin's face consists of puckered lips and slanted eyes that are always closed. It has two stubby appendages that are the same shape as its lips.
Gender differences
A female Gulpin has a shorter feather-like appendage than a male's.
Special abilities
Gulpin can swallow anything its own size due to the fact that Gulpin is practically all stomach. Gulpin's stomach fluids have enough acidity to melt scrap iron. Some of Gulpin's status move options include Yawn, Amnesia, Curse, and Snatch. Gulpin is also capable of a small handful of elemental attacks. It is one of the few Pokémon that can use Pain Split and Gunk Shot.
Behavior
Gulpin is known to eat in large quantities, most likely because its powerful stomach can handle anything.
Gulpin, the Stomach Pokémon. Gulpin is able to swallow items of its own size whole, as its stomach compresses most of its body. Its unique stomach acid allows it to digest almost anything.
In the manga
In the Pokémon Adventures manga
Swalot makes small and rather unimportant appearances in the Pokémon Adventures manga, being owned by minor Trainer characters and being seen as one of the rampaging Pokémon in the Emerald arc under Guile's command.
After being released from its Poké Ball, Gulpin will wait until an opponent passes by, then will use Swallow to trap and constantly damage them. The opponent may also be beat on while in Gulpin's mouth for extra damage.
Trophy Information
"A Stomach Pokémon. While it's a carefree Pokémon with a lovable face, it can swallow something the size of itself in one gulp. Its stomach is filled with gastric juices strong enough to dissolve anything it eats. As it matures, it learns Wring Out, a move which is as strong as the remaining strength of the Pokémon. It evolves into Swalot."
Virtually all of Gulpin's body is its stomach. As a result, it can swallow something its own size. This Pokémon's stomach contains a special fluid that digests anything.
Most of Gulpin's body is made up of its stomach - its heart and brain are very small in comparison. This Pokémon's stomach contains special enzymes that dissolve anything.
Gulpin's appearance may be based on a single, giant poison gland or even a gallbladder, the green sac-like organ that stores gastric acid. It also shares similarities with some snake species known to swallow their prey whole.
Name origin
Gulpin is a shortening of gulping (swallowing). It may also be a combination of "gulp" and "sculpin", as its appearance vaguely resembles the related wp:blobfish.
Gokulin may be a combination of ゴクリ gokuri (the sound of gulping) and toxin.